Its probably your browser or a combination of your browser and operating system. Mine works fine on linux and firefox, and on some windows computers with firefox, but others have not worked in the past. I think opera also worked at one point.

I don't get an error message, but I no longer get points... I don't know if they're related.

I'm not getting the points either. I had thought it was a cool new way to get points and expand the connection to facebook. You never know, maybe Facebook decided it was against one of their policies. (hence no more free facebook gifts, only discounts)